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Overview of Direct Protein Sequencing definitions

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  • Primary Structure
    Level of protein organization defined by the specific order and types of amino acids, crucial for determining function and higher structures.
  • Amino Acid Composition
    Profile describing the abundance and types of amino acids present in a protein, without indicating their sequence.
  • Amino Acid Sequence
    Linear arrangement of amino acids from the N-terminal to the C-terminal, revealing the protein’s unique identity.
  • Peptide Fragment
    Smaller segments generated from a large protein by cleavage, essential for sequencing and analysis.
  • Cell Lysis
    Process used to break open cells, enabling extraction of proteins for further purification and sequencing.
  • Protein Purification
    Set of techniques applied to isolate a specific protein from a mixture, often using chromatography methods.
  • Chromatography
    Separation method used to purify proteins or peptide fragments based on their physical or chemical properties.
  • HPLC
    High-performance liquid chromatography, a technique for separating and analyzing peptide fragments with high precision.
  • Amino Acid Hydrolysis
    Cleavage method using strong acid to break all peptide bonds, resulting in free amino acids for composition analysis.
  • Chemical Cleavage
    Technique employing specific chemicals to break targeted peptide bonds, producing defined peptide fragments.
  • Peptidase
    Enzyme that selectively cleaves peptide bonds at specific sites, generating smaller peptide fragments.
  • Edman Degradation
    Sequencing method that identifies amino acids sequentially from the N-terminal, enabling determination of protein sequence.
  • N-terminal
    Starting end of a protein or peptide, often the focus for sequencing techniques such as Edman degradation.
  • C-terminal
    Terminal end of a protein or peptide, marking the completion of sequence determination.
  • FDNB
    Chemical reagent used to identify the N-terminal amino acid residue, aiding in protein sequencing strategies.